
This sticky is for announcements of pertinent scientific events, such as conferences, seminars, or public talks. This...

Jul2714 12:49 AM
marcus

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64,296 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Jul1412 08:32 AM
ZapperZ

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I'm having a bit of trouble understanding a past exam paper that i'm revising for where it asks.
How the the...

Jan1609 08:41 PM
pazmush

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Cambridge press says available as of around 1 March, so in a couple of months.
Samples are available of page proofs...

Jan1609 01:24 PM
exponent137

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I was wondering if my understanding of string theory was right and if not could someone please correct me.
1.)Is...

Jan1509 10:02 PM
humanino

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1,949 
Topological Strings = 3
Superstrings = 10
Bosonic strings 26
Tensionless strings = arbitrary
Do you know of any...

Jan1409 09:28 AM
Demystifier

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My question is simple and straight forward  how does a 1dimensional string "convert" to a zerodimensional point...

Jan1209 04:36 PM
derek.basler

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As suggested by Marcus, I have read the whole paper and decided to start a discussion of Kober's paper by asking a few...

Jan1209 02:15 PM
Blackforest

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Dear colleagues
I have recently come across a mathematical reference discussing all possible generalizations of...

Jan1109 10:03 PM
Professor_E

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Is it true that the existence of extra dimensions can lower the unification scale to the GeV scale? Does this mean...

Jan1009 07:36 AM
karnten07

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1,916 
http://arxiv.org/abs/0901.0640
Horizons and the cosmological constant
Krzysztof A. Meissner
6 pages
(Submitted on...

Jan909 10:24 PM
marcus

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The poll allows multiple choices...which are your picks for the 2008 papers likely to prove most valuable to future...

Jan809 11:28 PM
marcus

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2,697 
How does Dark Matter/Energy fit in the picture of the Standard model? Do they work together or contradict each other?...

Jan809 02:48 PM
Wand3L

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GR predicts gravitational waves, and QM says all waves are also particles.
But does the particle of gravity have...

Jan709 04:26 PM
Orbb

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I am searching material in second quantization in ashtekarlike formulation gravity.
Somebody knows something like...

Jan709 04:25 AM
Demystifier

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1,457 
Physicists offer foundation for uprooting a hallowed principle of physics
January 5th, 2009 in Physics / Physics
...

Jan609 09:00 PM
MTd2

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1,501 
A finding that may have interest.
http://arxiv.org/PS_cache/arxiv/pdf/0901/0901.0510v1.pdf
Quote.
Some new...

Jan609 11:18 AM
wolram

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If you've read Lightness of Being, which just came out, then you may see that the core ideas of the book are presented...

Jan409 07:26 PM
Fra

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Hello, I am an old engineer with a curiosity about some of the background independent QG models, CDT, graphity, &ct. ...

Jan409 01:50 AM
skippy1729

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1,907 
http://edge.org/q2009/q09_index.html
At least one of this year's "big change coming" predictions had to do with...

Jan209 01:49 PM
marcus

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I wonder if quantum gravity effects can explain Inflation after the Big Bang? For example, in Loop Quantum Gravity,...

Jan109 12:46 PM
marcus

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Rightly or wrongly, there's considerable excitement about a paper which a postdoc theorist at CERN, Bob McElrath,...

Jan109 03:42 AM
Haelfix

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4,388 
Why do we require a backgroundfree theory when we have such a convenient and universal cosmic microwave background...

Dec3108 10:57 AM
starkind

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1,516 
Hi all,
I've recently been reading about string field theory (note: I'm a novice). As I understand, the string...

Dec3108 10:57 AM
friend

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11,529 
What I mean by QG (quantum geometry = quantum gravity) is an approach that provides some type of quantum universe...

Dec3008 08:15 PM
marcus

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Is there a reason (inherent in the theory) that string theory describes 10 spatial dimensions with 7 of them curled up...

Dec2708 09:20 PM
Phrak

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I hope this news isn't moved to another forum  many of our readers would be interested in this:
Quantum computer...

Dec2708 02:36 AM
Hurkyl

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The Universe: Parallel Universes
Part 1
<object width="425" height="344"><param name="movie"...

Dec2608 10:18 PM
remix220

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With any luck, sometime soon you can read this paper on the arXiv:
Aristide Baratin and Laurent Freidel
Hidden...

Dec2408 08:37 PM
MTd2

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17,689 
Here is some background on Leonardo Modesto's new paper:
It is in this context that Leonardo Modesto has shown...

Dec2408 04:08 PM
MTd2

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http://arxiv.org/PS_cache/arxiv/pdf/0812/0812.3857v1.pdf
Quote.
In the first part of this contribution, we...

Dec2308 01:40 PM
MathematicalPhysicist

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Hi,
In my research I've heard of the Hierarchy problem expressed under at least two different guises:
1)...

Dec2208 12:31 PM
nrqed

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5,225 
Hi guys,
I'm reading about unification of guage couplings in the presence of extra dimensions but i'm coming...

Dec2208 12:24 PM
nrqed

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2,515 
http://physicsforums.com/showthread.php?p=1162921#post1162921
http://math.ucr.edu/home/baez/marseille/krasnov.jpg
...

Dec1908 10:45 AM
MTd2

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3,011 
Here's a paper helping to sort out the situation with spinfoams. I think it is probably important. Actually we've been...

Dec1908 06:44 AM
MTd2

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1,619 
I'm trying to understand how Randall and Sundrum go from Eq. (9) to Eq. (10) in their RS1 paper:
...

Dec1908 02:50 AM
jdstokes

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1,436 
Don't really want to go into much detail here :P, was just wondering during a crappy elctro/physics lesson today;
I...

Dec1708 11:51 AM
BenTheMan

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howya  for those who hold to a theory of gravitons being the operative mechanism of gravity (as opposed to GR), i...

Dec1608 01:18 PM
jnorman

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1,798 
My question is naive and may be incorrectly formulated
So, the bulk: http://en.wikipedia.org/wiki/Brane_cosmology...

Dec1608 10:35 AM
Dmitry67

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So this is something that's been bothering me for awhile and I seem to be getting no closer to understanding it on my...

Dec1608 03:39 AM
Coin

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1,339 
If you want some background on this question (i.e. why I'm asking), let me know.
But either way, this is a basic...

Dec1408 09:26 PM
BenTheMan

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1,976 
Lets say I make 2slit interf. experiment with slow (low enegry) electrons. I make their path as long as possible so...

Dec1408 09:13 PM
Hyperreality

6 
1,449 